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Noble Torrent Crimson

#ac151d
Notes

Noble Torrent Crimson (#AC151D) is a true red with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (357°, 78%, 38%) places it in the highly saturated band at a mid lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. For a confident two-color system, pair it with its complementary cyan. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#ac151d
RGB
rgb(172, 21, 29)
HSL
hsl(357, 78%, 38%)
HWB
hwb(357 8% 33%)
OKLCH
oklch(47.7% 0.182 26.0)
HSV
hsv(357, 88%, 67%)
LAB
lab(36.74% 57.15 37.69)
LCH
lch(36.74% 68.45 33.40)
CMYK
cmyk(0%, 88%, 83%, 33%)

Etymology

Noble
adjective

Latin nōbilis, well-known / illustrious — sharing root with gnōscere (to know). As a color modifier, noble implies a saturated-and-dignified-and-aristocratic quality, the deep-rich color of pre-modern European noble-class hereditary-aristocratic livery-and-armorial bearings. Sits at the bold-and-aristocratic end of the grid, parallel to aristocratic and highborn in usage.

Torrent
modifier

Latin torrens, rushing-or-burning-stream. As a color modifier, torrent implies a rushing-and-deluge-and-flash-flood quality, the visual register of Alpine-and-Pyrenean-torrent hand-rushing-and-deluge-and-flash-flood Alpine-and-Pyrenean-torrent-and-monsoon-deluge torrent-and-rushing-and-deluge surfaces under Alpine-and-Pyrenean-torrent-and-monsoon-deluge Alpine-Dolomites-and-Pyrenean-cirque deluge-rushing-water-light. Sits at the modifier-and-weather end of the grid, parallel to rain and thaw in usage.

Crimson
noun

From the Old Spanish cremesin, itself from the Arabic qirmiz — the kermes scale insect, dried and ground into a brilliant carmine dye prized in the medieval Mediterranean. For centuries the most expensive red on a draper's shelf, reserved for cardinals, kings, and the cloth that gave English the word crimson. Cooler than scarlet, deeper than rose; the color of pomegranate seeds and a serious occasion.

Closest matches

The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.

Variations

Click any swatch to explore

Harmonies

Accessibility

Color-vision simulation

How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.

#ac151d
Original
#4a421b
Protanopia
#6e6215
Deuteranopia
#be001b
Tritanopia
#363636
Achromatopsia
WCAG contrast

The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.

The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAAon White
7.29:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.88:1

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